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SX1240ISTRT

Low Cost Integrated Transmitter IC 434 MHz and 868 MHz Band RF Transmitter

Semtech Corporation 

ADVANCED COMMUNICATIONS & SENSING

SX1240

Integrated Transmitter IC

DATASHEET

Symbol Description

T_START Time before CTRL pin mode

selection.

Conditions

Time from power on to sampling of

CTRL ***

Min

Typ

Max Unit

-

200 us

- ms

+ TS_OSC

* Frequency deviation is positive (+FDA) with DATA = ‘1’, negative (-FDA) with DATA = ‘0’

** With two different matching networks

*** The oscillator startup time, TS_OSC, depends on the electrical characteristics of the crystal

**** Ramp-up time of the internal regulator turning the PA on. The typical 10% - 90% power ramp-up time is 10us

2.5. Timing Characteristics

The following table gives the operating specifications for the TWI interface of the SX1240.

Table 5 Serial Interface Timing Specifications

Symbol Description

fctrl

tch

tcl

trise

tfall

tsetup

CTRL Clock Frequency

CTRL Clock High time

CTRL Clock Low time

CTRL Clock rise time

CTRL Clock Fall time

DATA Setup time

thold

DATA hold time

Conditions

From Data transition to CTRL rising

edge

From CTRL rising edge to DATA

transition

Min Typ Max Unit

-

-

10 MHz

45

-

- ns

45

-

- ns

-

-

5 ns

-

-

5 ns

45

-

- ns

45

-

- ns

SX1240, Rev 1, Oct 2010

©2010 Semtech Corp.

Page 7

www.semtech.com

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